Panasonic SX-PX554M, Руководство по обслуживанию

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PCB TEST MODE Procedure
MAIN Wave ROM check
MAIN: IC12, IC18
1. Press and hold the two E keys shown below, and then turn on the power switch.
2. Select the POP GROUND sound.
3. Reduce the MAIN VOLUME level low enough.
When set to the self-diagnostic mode, the Wave ROM outputs a sine
The Wave ROMs correspond to the keyboard keys as shown in the
to the right. When a key is pressed, the corresponding sine wave
produced. If no sound is produced, or if the sound is distorted, the
ROM corresponding to that key is defective. This method allows to
diagnose also the output routes (L/R) from the Wave ROM.
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The key number indicates the Wave ROM number.
(I-1: IC12, I-2: IC18)
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